/*
 * Copyright 2019 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 *
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.model;

import java.util.Collections;
import java.util.List;

public interface Condition {

    default List<Condition> getSubConditions() {
        return Collections.emptyList();
    }

    Type getType();

    Variable<?>[] getBoundVariables();

    default Condition cloneCondition() {
        throw new UnsupportedOperationException();
    }

    enum Type {
        PATTERN( false ), EVAL( false ), QUERY( false ),
        ACCUMULATE( false ), GROUP_BY( false ), TEMPORAL( false ),
        RECEIVER( false ), SENDER( false ),
        OR( true ), AND( true ), NOT( false ), EXISTS( false ), FORALL( false ), CONSEQUENCE( false );

        private final boolean composite;

        Type( boolean composite ) {
            this.composite = composite;
        }

        public boolean isComposite() {
            return composite;
        }

        public boolean createsScope() {
            return this == OR;
        }
    }
}
